import WebIDL


def WebIDLTest(parser, harness):
    # Check that error messages put the '^' in the right place.

    threw = False
    input = """\
// This is a comment.
interface Foo {
};

/* This is also a comment. */
interface ?"""
    try:
        parser.parse(input)
        parser.finish()
    except WebIDL.WebIDLError as e:
        threw = True
        lines = str(e).split("\n")

        harness.check(len(lines), 3, "Expected number of lines in error message")
        harness.ok(
            lines[0].endswith("line 6:10"),
            'First line of error should end with "line 6:10", but was "%s".' % lines[0],
        )
        harness.check(
            lines[1],
            "interface ?",
            "Second line of error message is the line which caused the error.",
        )
        harness.check(
            lines[2],
            " " * (len("interface ?") - 1) + "^",
            "Correct column pointer in error message.",
        )

    harness.ok(threw, "Should have thrown.")